Scale mechanism



N. TATHAM 1,390,706

SCALE MECHAN I SM Dec. 13, 1932.

Filed No'v. so, 1929 INVENTOR: 4) 29 M A M 77rHflM X ATTORNEY.

0' certain weight, which, however,tmay differ UNITED. STA

, actuating a Weight-indicatingmechanism and Patented Dec. 13, 1932 TEIS PATENT OFFICE Holman TernAM, or rosANenLEs, CALIFORNIA SCALE MECHANISM ap imatidn filed November 30, 1929'. Serial No.410,724.

This invention relates to devices used for operative by a weight or material supporting platform. I a

One of the objects of this invention is to provide an operating leverwith a curved portion so; designed that the variousmovements' of the platform can be'transmitted through theflever by means of the curved portion to result in movements of predetermined equal distances on the dial ofthe weight-indicating mechanism.

Another object is to provide adjustable locking means for the lever by which the lever M and therewith theweight-indicating mechanism can be held in inoperative position.

Another obj ect is to. provide releasing means for the locking means in order that the lever can follow the movements of the upwardly extending connecting rod of the platform for transmitting such movements to the weight-indicating mechanism.

Another object is to provide controlling means whereby the lever can be set' so as to bring the indicating mechanism in to certain predetermined positions. 1

Other objects willappear from the follow-. ing description and appended claims as wellas from p the accompanying drawing, in

l which- Fig.1 is a side' elevation ofa scale partly broken away in itsupper portion to illustrate the cooperative relation of certain parts according to this invention.

Fig. 2 is a fragmentary detail side elevation of an operating lever illustrated in cooperative relation to otherpartsby which the lever is actuated and which in turn are actuated by the lever. v I

A weight indicating mechanism suggested and referred to in this application and commonly used on scales of the type involved in this application generally includes a dial-and an indicating hand in which thehand moves over a certain range or space or distance on the dial to indicate certain variations of a .weight. t

A platform,on the otherhand, also moves a certain distance under thejinfiuence of a lever'll eventually from point c 7 distance indicated better by thedotted lines considerably from the movement of the hand in regard to the dial. The end 3 of the lever 4 as illustrated in the drawing 'in Fig; 1, operatively connected to the gear-rack 5 for rotating the gear-pinion6 by which the hand 7 may be moved in regard to the dial-head 8, may be moved from the point a to the point a indicated in Fig. 2;

whilethe top plate 9 of-the rod 10 extending upwardly from the platform should move only from the point b to the point 6 which wouldbring the same contacting point of the to point 0 a designated between the points 5 and b From this it will be clear that a lever des1 gned to contact with the same point on the top surface of the plate 9 would move further than properly required by the movement of the platform on which the lever depends for its operation.

By curving the contacting edge of the leverend 11 in the manner indicated at 12 it is made possible to transmit any movement from the base 14 through therod 10 passing upwardly through the standard or upright 15 of the scaleto the'weight-indicating dial in the head 8 of the scale.

Moreover, the curving of the lever-end 11 platform 13 of the scale disposed over the at 12 facilitates a transforming of any move ment, regardless of how uneven various movements caused by various weights may be, into certain equally proportioned movements on the dial by reason of the fact that the curvature of the lever-end 11 is designed so as to'take care of this very feature, that is, of assuring accurately equalized move- -ments of the indicating hand over the equally though some of the parts make the lever adjustable and more practical.

An adjustable locking screw 16 is provided on the lever to cooperate with the locking 5 pawl 17 forholding the weight-indicating mechanism in inoperative position. i For limiting the movements of the lever and for controlling the starting and stopping positions of thelever an adjustablescrew 20 is also provided on the lever.

The pawl 17 is provided=with a portion. 18 to be disposed in the path of a coin or other similar actuating member to be dropped through a suitable chute of which the upper end'is indicated at 19 for releasing the pawl from engagement with the lever for the proper operation of the weight indicating mechanisml p Having thus described my invention, I ficlaimz y I i 1. In a scale, in combination with a weightsupporting mechanism and a weight-indicate ingmechani sm, alever comprising substan tially, twoswingable' ends with "a common 3 central pivotesupport with means for pivotal connection withsaid indicating mechanism at one end and embodying a curved portionin the other of said ends forming the operatingradius varying contacting means by which Q the various movements of the weight-supporting mechanism can betransformed into certain. proportioned movements. in the weight-indicating mechanism. 2. In ascale, a weightrsupporting, mecha- 13 nism including a contact-member in its uppermost terminal, a weight-indicating mechanism, and a lever operative'ly connected'to the weight-indicating mechanism and em. bodying a curvedportionto contactwiththe a? said contact member and adapted to transform'the various movements of the weight.- supporting' mechanism in equally propor-. tioned movements inithe weight-indicating mechanism. i 55 3. Ina scale; aweight-supporting mechanism, a weightindicatingmechanism, a lever embodying a curved contact-portion adapted to contactwith one of said mechanisms in such a manner. as to synchronize the movements of the two mechanisms, anadjustable I locking means for the lever-for holding the lever in inoperative position, and an adjustable checking means forsetting the lever for: a predetermined starting a-ndstopping posi- 55? tion.

In testimony that I claim the foregoing as my invention I have signed my name.-

\ NORMAN TATHAM. 

